I'm not an industry researcher, so all I have to go on is my experiences.
I was a tiny kid, playing with Simons BASIC and having fun. But I never thought of it as a career path. No one I knew was in IT, no one in the family, or friend's families was in IT.
At school it wasn't something that was talked about as a career path (though nursing and teaching were).
I didn't realize I wanted to be a developer until I got a random part time job at university and built websites and databases. (I was majoring in engineering at the time)
That left me with a big gap in skill set from everyone else my age who had been playing around with tech since they were pre-teens.
But things are relatively hunky-dory now.
But I always think, what if I hadn't gotten that random job? Why hadn't I been exposed to this career before then?
Would it have been industry sexism that meant I wasn't a developer? No. It would have been lack of exposure to the possibility at a young age.